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  2. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    The T g values of commercial grades of PMMA range from 85 to 165 °C (185 to 329 °F); the range is so wide because of the vast number of commercial compositions that are copolymers with co-monomers other than methyl methacrylate. PMMA is thus an organic glass at room temperature; i.e., it is below its T g.

  3. Recycling - Wikipedia

    en.wikipedia.org/wiki/Recycling

    Additionally, a United States Environmental Protection Agency (EPA) study that tracked the price of clear glass from 15 July to 2 August 1991, found that the average cost per ton ranged from $40 to $60 [140] while a USGS report shows that the cost per ton of raw silica sand from years 1993 to 1997 fell between $17.33 and $18.10.

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